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Thanks to the new missions such as Kepler and CoRoT the number of exoplanetsdiscovered up to day has considerably increased. In order to know the possiblehabitability of these planets, it is mandatory to explore and investigate more aboutthem.The Exoplanet Characterization Observatory or EChO mission will study theatmosphere of known extrasolar planets searching for key components to describethe chemical/thermal structure of the planet and constrain models of atmosphericdynamics and circulation, and internal structure models.An important key to ensure the accuracy and reliability of the data is to takeinto account the variability of the host star and the possible impact on the spectraobtained by EChO.The stellar variability can be explained as the change in brightness of the star.This variation can be related to magnetic processes inside the star, which will producestarspots and flares. Convection processes can also cause variation like oscillationsand granulation.Focused on flares, events associated with magnetic reconnection, and whichproduce emission in all wavelength, this thesis is a study of the impact of those flareson the EChO mission system sensitivity.After a literature study and the application of those results to the EChO mission,a flare rate of 3.5 flares per 10 hours observation was found, which implies 2 hours ofdata loss.

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